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https://issues.apache.org/jira/browse/MAPREDUCE-4924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13554540#comment-13554540
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Robert Kanter commented on MAPREDUCE-4924:
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The test failure is unrelated. It fails without the patch too.
> flakey test: org.apache.hadoop.mapred.TestClusterMRNotification.testMR
> ----------------------------------------------------------------------
>
> Key: MAPREDUCE-4924
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4924
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv1
> Affects Versions: 2.0.2-alpha
> Reporter: Robert Kanter
> Assignee: Robert Kanter
> Priority: Trivial
> Attachments: MAPREDUCE-4924_branch-1.patch,
> MAPREDUCE-4924_branch-1.patch, MAPREDUCE-4924.patch, MAPREDUCE-4924.patch
>
>
> I occasionally get a failure like this on
> {{org.apache.hadoop.mapred.TestClusterMRNotification.testMR}}
> {code}
> junit.framework.AssertionFailedError: expected:<6> but was:<4>
> at junit.framework.Assert.fail(Assert.java:47)
> at junit.framework.Assert.failNotEquals(Assert.java:283)
> at junit.framework.Assert.assertEquals(Assert.java:64)
> at junit.framework.Assert.assertEquals(Assert.java:195)
> at junit.framework.Assert.assertEquals(Assert.java:201)
> at
> org.apache.hadoop.mapred.NotificationTestCase.testMR(NotificationTestCase.java:184)
> ...
> {code}
> It looks like a race condition:
> {code}
> // run a job with FAILED status
> System.out.println(UtilsForTests.runJobFail(this.createJobConf(), inDir,
> outDir).getID());
> Thread.sleep(2000);
> assertEquals(6, NotificationServlet.counter);
> assertEquals(0, NotificationServlet.failureCounter);
> {code}
> Instead of sleeping for 2 seconds, we should keep checking the counter and
> fail after a timeout. There's a couple of similar places in the test that
> should be fixed too.
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